WO2005106914A2 - Means for suspending a mask/frame set for a cathode ray tube - Google Patents

Means for suspending a mask/frame set for a cathode ray tube Download PDF

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Publication number
WO2005106914A2
WO2005106914A2 PCT/FR2005/050230 FR2005050230W WO2005106914A2 WO 2005106914 A2 WO2005106914 A2 WO 2005106914A2 FR 2005050230 W FR2005050230 W FR 2005050230W WO 2005106914 A2 WO2005106914 A2 WO 2005106914A2
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WO
WIPO (PCT)
Prior art keywords
frame
springs
mask
tube
cathode ray
Prior art date
Application number
PCT/FR2005/050230
Other languages
French (fr)
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WO2005106914A3 (en
Inventor
Enzo Arata
Andrea Giuliani
Tommaso Petitti
Original Assignee
Thomson Licensing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Licensing filed Critical Thomson Licensing
Publication of WO2005106914A2 publication Critical patent/WO2005106914A2/en
Publication of WO2005106914A3 publication Critical patent/WO2005106914A3/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0705—Mounting arrangement of assembly to vessel
    • H01J2229/0711—Spring and plate (clip) type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0727—Aperture plate
    • H01J2229/0738—Mitigating undesirable mechanical effects

Definitions

  • the invention relates to a cathode ray tube in colors and more particularly to the suspension system of the frame / mask device for selecting colors arranged inside the glass envelope of the tube.
  • the invention finds its application in any type of tube comprising a mask for selecting colors and is equally well suited to tubes whose mask is held in tension by the frame on which it is secured as to tubes whose mask is formed by pressing a metal sheet.
  • Cathode ray tubes have a color selection mask located at a precise distance from the inside of the glass front face of the tube, front face on which are deposited arrays of red, green and blue phosphors.
  • the phosphor networks allow the reproduction of images on the screen, the mask allowing each determined beam to illuminate only the phosphor of the corresponding color.
  • the color selection mask must be placed and maintained during the manufacture of the tube, then during its operation, in a precise position inside said tube.
  • the holding functions are carried out thanks to a generally very rigid rectangular metal frame on which the mask is conventionally welded.
  • the frame / mask assembly is mounted in the front face of the tube by means of suspension comprising at least three pins included in the front face of the tube and three metal parts forming a spring welded to the frame at one of their ends, each of said ends. metal parts being also pierced with an opening at its other ends, opening in which engages one of the pins included in the glass front face.
  • the springs must be rigid enough to support the weight of the assembly
  • the frame / mask which can reach several kilos for large tubes.
  • Two arrangements of the suspension means are used conventionally: either at the middle of the sides of the frame, or at the corners of the latter.
  • the large screen tubes have suspensions preferably arranged in the corners, this arrangement having the advantage of offering better mechanical rigidity ensuring that the initial adjustment of the mask / screen distance will not be modified during the stages of manufacture of the tube and that the finished tube will offer a better guarantee against implosion.
  • the frame / mask assembly must be able to be disassembled and precisely reassembled, this several times during the different stages of the tube manufacturing process, by compression of the suspension springs to release them from the metal pins included in the glass of the front face, and without the need to re-adjust the distance from the mask to the screen at each reassembly.
  • the frame / mask assembly is installed in the front face of the tube. So that the openings of each spring can engage in each metal pin included in the skirt of the front face of the tube, the openings of the springs must coincide with the said pins.
  • the suspension springs generally extend in a direction substantially parallel to the surface of the screen in the same orientation, that is to say with respect to the frame / mask either in the direction of rotation of the needles of a shows either in the opposite direction to this direction.
  • this structure leads to problems of rotation of the frame / mask assembly when the latter expands during the operation of the tube. This rotation leads to register errors, the correspondence between the electron beams and their landing on the tube screen then no longer being nominal.
  • the means for supporting a frame / mask assembly of a color cathode ray tube comprise a plurality of metal pins inserted in the glass front face of the tube, and a plurality of springs of metal extending in a direction substantially parallel to the external surface of the front face, the springs being attached to the frame at a first end and comprising at their second end an opening intended to engage around one of the metal pins , the suspension means being characterized in that at least two of said springs, attached to two opposite sides of the frame extend so that their first end is located on the same side of the plane parallel to the longitudinal axis of the tube and passing through the center of the openings at their second end.
  • FIG. 1 represents a cathode ray tube according to the invention seen partially in exploded view
  • FIG. 2 represents a spring of suspension of the frame / mask assembly
  • FIG. 3 illustrates a frame / mask assembly suspended according to the state of the art
  • FIG. 4 shows in a top view a frame / mask assembly suspended according to an embodiment of the invention
  • a color cathode ray tube (1) as illustrated in FIGS. 1, comprises a glass envelope in three distinct parts, the front face 2 inside which is deposited a screen 3 made of luminescent material, the rear 4 funnel-shaped and the neck 5 substantially cylindrical and surrounding the electron gun 6 generating three electron beams towards the screen.
  • a color selection mask 11 pierced with openings or slots is placed in the tube on the paths of the electron beams, between the screen 3 and the barrel 6.
  • the mask 11 is welded to a rigid frame 10 held in place position in the front face of the tube thanks to suspension means comprising metal pins 8 embedded in the glass skirt 7 of the. front face and springs 9 welded to the frame and having openings intended to cooperate with said pins, the end of which is generally of frustoconical shape.
  • the mask must be placed at a very precise distance from the screen to allow correct operation of the finished tube, that is to say mainly that each of the beams comes to illuminate the phosphors of the primary color corresponding to it.
  • This distance measured in the direction of the main axis Z of the tube, is known as the "Q distance".
  • FIG. 2 illustrates in detail an example of a suspension spring for the frame / mask assembly.
  • the spring 9 is secured alongside the frame 10, for example by welding, at several points 20 of its first end 21; the spring 9 comprises an arm 22 which can extend for example substantially parallel to the side of the frame to which it is secured and ends in a second end 23 comprising an opening 24 intended to cooperate with a pin inserted in the skirt of the mask in order to keep the frame in the tube by spring effect.
  • the dispersions in the positioning of the metal pins required using at least one spring 9 with an opening of larger diameter than the diameters of the openings of the other springs in order to catch up with these dispersions.
  • a washer was previously placed on the pin before inserting the spring, then the spring / washer assembly was welded together to immobilize the frame, avoiding any mechanical play.
  • FIG. 3 it is known to use four springs 9 arranged substantially at the center of the sides of the frame 10 so that the arms of these springs are oriented in the same direction around the frame, that is to say in the direction clockwise or counterclockwise.
  • two springs, attached to two opposite sides of the frame extend so that their first end is located on either side of the plane parallel to the longitudinal axis of the tube and passing through the center of the openings located at their second end.
  • the frame / frame assembly is suspended inside the tube by means of three springs 19, 29 of structure similar to that of the springs 9 and arranged in the following manner : one of said springs 19 is secured substantially to one of the long sides of the frame by welding its first end to the frame at a point C thereof; in a preferred embodiment the opening located at its second end is located substantially at the middle of said side of the frame the two other springs 29 are secured respectively at A and B on each of the two short sides of the frame so that the points A and B are located on the same side of the plane passing through the openings 24 of said two springs and parallel to the longitudinal axis Z.
  • the openings 24 of the springs 29 intended to engage around the pins located in the skirt 7 of the panel front of the tube can be arranged either substantially at the middle of the short opposite sides of the frame or moved towards the corners of the frame near the long side opposite to that on which the spring 19 is attached.
  • This structure minimizes the problems of rotation of the frame during the thermal expansion phases due to the operation of the tube and the invention also makes it possible to obtain very good mechanical stability of the 'frame / mask assembly suspended inside the tube with only three springs; in fact, this arrangement increases the area of the lift triangle ABC compared to an arrangement of three springs according to the state of the art.
  • two metal parts are saved: a suspension spring and the adjustment washer since with only three
  • the three openings of the springs are necessarily in the same plane.
  • the embodiments described in example are not limiting and the invention can also be implemented with two springs 29 secured respectively on each of the opposite long sides of the frame and the spring 19 on one of the short sides of the same frame .

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  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

A color cathode ray tube comprising a glass front surface on which a luminescent material is placed, in addition to a frame/mask set for the selection of colors, said mask being maintained on a frame by means of welding and the mask/frame set being suspended inside the tube with the aid of support means, wherein at least two of the support means are embodied in the form of a metal part (29) acting as a spring, wherein the springs are attached to two opposite sides of the frame at the level of a first extremity (21) and comprise an opening on the second extremity (23) which is engaged around one of the metal parts, said two springs extending in such a way that the first extremity thereof is located on the same side of the plane parallel to the longitudinal axis of the tube, passing via the center of the openings situated at the second extremity thereof. Said structure makes it possible to increase the mechanical behavior of the frame/mask unit.

Description

MOYENS DE SUSPENSION D'UN ENSEMBLE CADRE/MASQUE POUR TUBE A RAYONS CATHODIQUES MEANS FOR SUSPENDING A FRAME / MASK ASSEMBLY FOR A TUBE WITH CATHODE RAYS
L'invention se rapporte à un tube à rayons cathodiques en couleurs et plus particulièrement au système de suspension du dispositif cadre/masque de sélection des couleurs disposé à l'intérieur de l'enveloppe en verre du tube L'invention trouve son application dans tout type de tube comportant un masque de sélection de couleurs et est aussi bien adaptée aux tubes dont le masque est maintenu en tension par le cadre sur lequel il est solidarisé comme aux tubes dont le masque est formé par pressage d'une feuille métallique. Les tubes à rayons cathodiques comportent un masque de sélection des couleurs situé à une distance précise de l'intérieur de la face avant en verre du tube, face avant sur laquelle sont déposés des réseaux de luminophores rouges, verts et bleus. Sous l'influence de trois faisceaux électroniques correspondants chacun à une couleur primaire déterminée, les réseaux de luminophores permettent la reproduction d'images sur l'écran, le masque permettant à chaque faisceau déterminé de n'illuminer que le luminophore de la couleur correspondante. Le masque de sélection des couleurs doit être disposé et maintenu pendant la fabrication du tube, puis pendant son fonctionnement, dans une position précise à l'intérieur dudit tube. Les fonctions de maintien sont réalisées grâce à un cadre métallique rectangulaire généralement très rigide sur lequel le masque est conventionnellement soudé. L'ensemble cadre/masque est monté dans la face avant du tube grâce des moyens de suspension comportant au moins trois pions inclus dans la face avant du tube et trois pièces métalliques formant ressort soudées au cadre en l'une de leurs extrémités, chacune desdites pièces métalliques étant par ailleurs percée d'une ouverture à son autre extrémités, ouverture dans laquelle vient s'engager un des pions inclus dans la face avant en verre. Les ressorts doivent être suffisamment rigides pour supporter le poids de l'ensemble The invention relates to a cathode ray tube in colors and more particularly to the suspension system of the frame / mask device for selecting colors arranged inside the glass envelope of the tube. The invention finds its application in any type of tube comprising a mask for selecting colors and is equally well suited to tubes whose mask is held in tension by the frame on which it is secured as to tubes whose mask is formed by pressing a metal sheet. Cathode ray tubes have a color selection mask located at a precise distance from the inside of the glass front face of the tube, front face on which are deposited arrays of red, green and blue phosphors. Under the influence of three electron beams each corresponding to a given primary color, the phosphor networks allow the reproduction of images on the screen, the mask allowing each determined beam to illuminate only the phosphor of the corresponding color. The color selection mask must be placed and maintained during the manufacture of the tube, then during its operation, in a precise position inside said tube. The holding functions are carried out thanks to a generally very rigid rectangular metal frame on which the mask is conventionally welded. The frame / mask assembly is mounted in the front face of the tube by means of suspension comprising at least three pins included in the front face of the tube and three metal parts forming a spring welded to the frame at one of their ends, each of said ends. metal parts being also pierced with an opening at its other ends, opening in which engages one of the pins included in the glass front face. The springs must be rigid enough to support the weight of the assembly
cadre/masque qui peut atteindre plusieurs kilos pour les tubes de grandes dimensions. Deux dispositions des moyens de suspension sont coπventionnellement utilisées : soit au niveau des milieux des cotés du cadre, soit au niveau des coins de ce dernier. Les tubes de grandes dimensions d'écran ont des suspensions préferentiellement disposées dans les coins, cette disposition présentant I' avantage d'offrir une meilleure rigidité mécanique garantissant que le réglage initial de la distance masque/écran ne va pas être modifiée durant les étapes de fabrication du tube et que le tube fini va offrir de meilleure garantie contre l'implosion. L'ensemble cadre/masque doit pouvoir être démonté et précisément remonté, cela plusieurs fois durant les différentes étapes du processus de fabrication du tube, par compression des ressorts de suspension pour les dégager des pions métalliques inclus dans le verre de la face avant, et sans qu'il soit nécessaire à chaque remontage de régler à nouveau la distance du masque à l'écran. Pour les cadres de grandes dimensions il peut être nécessaire d'utiliser quatre ressorts de suspension disposés soit sur les cotés du cadre, soit dans les coins de celui-ci. Les ressorts sont soudés sur le cadre avec une certaine tolérance puis l'ensemble cadre/masque est installé dans la face avant du tube. Pour que les ouvertures de chaque ressort puissent s'engager dans chaque pion métallique inclus dans la jupe de la face avant du tube, il faut que les ouvertures des ressorts coïncident avec les dits pions. Pour résoudre les problèmes de positionnement provenant des tolérances admises dans la position des pions et des ouvertures des ressorts, il est commun d'utiliser trois ressorts identiques possédant une ouverture d'un diamètre déterminé, adapté pour venir se positionner précisément sur le pion de forme troncoπique, et un ressort possédant une ouverture de diamètre plus important que le précédent. Le cadre est alors installé dans la face avant sans contrainte mécanique, l'ouverture plus grande absorbant les différentes tolérances. Pour éviter tout jeu mécanique du cadre par rapport aux pions, une rondelle de diamètre égal au diamètre frame / mask which can reach several kilos for large tubes. Two arrangements of the suspension means are used conventionally: either at the middle of the sides of the frame, or at the corners of the latter. The large screen tubes have suspensions preferably arranged in the corners, this arrangement having the advantage of offering better mechanical rigidity ensuring that the initial adjustment of the mask / screen distance will not be modified during the stages of manufacture of the tube and that the finished tube will offer a better guarantee against implosion. The frame / mask assembly must be able to be disassembled and precisely reassembled, this several times during the different stages of the tube manufacturing process, by compression of the suspension springs to release them from the metal pins included in the glass of the front face, and without the need to re-adjust the distance from the mask to the screen at each reassembly. For large frames it may be necessary to use four suspension springs arranged either on the sides of the frame or in the corners of it. The springs are welded to the frame with a certain tolerance then the frame / mask assembly is installed in the front face of the tube. So that the openings of each spring can engage in each metal pin included in the skirt of the front face of the tube, the openings of the springs must coincide with the said pins. To solve the problems of positioning coming from the tolerances allowed in the position of the pins and the openings of the springs, it is common to use three identical springs having an opening of a determined diameter, adapted to come to be positioned precisely on the shaped pin frusto-conical, and a spring having a larger diameter opening than the previous one. The frame is then installed in the front face without mechanical stress, the larger opening absorbing the different tolerances. To avoid any mechanical play of the frame with respect to the pins, a washer with a diameter equal to the diameter
des ouvertures des trois ressorts identiques est alors insérée sur le pion et soudée sur le quatrième ressort. Les ressorts de suspension s'étendent généralement dans une direction sensiblement parallèle à la surface de l'écran suivant la même orientation c'est à dire en s'étendant par rapport au cadre/masque soit dans le sens de rotation des aiguilles d'une montre soit en sens inverse de ce sens. On sait que, tel qu'indiqué dans le brevet US4613785, cette structure conduit à des problème de rotation de l'ensemble cadre/masque lorsque celui-ci se dilate durant le fonctionnement du tube. Cette rotation entraîne des erreurs de registre, la correspondance entre les faisceaux d'électrons et leur atterrissage sur l'écran du tube n'étant plus alors nominale. Par ailleurs, on a remarqué que ce phénomène d'erreur de registre du à la dilatation de l'ensemble cadre/masque était beaucoup plus sensible pour les tubes dont la surface externe de la face avant était sensiblement plane; en effet il en résulte que la surface du masque correspondant est alors moins courbe qu'auparavant et la rigidité mécanique résultante de l'ensemble plus faible. Pour diminuer cette sensibilité, les moyens de support d'un ensemble cadre/masque d'un tube à rayons cathodiques en couleurs selon l'invention comprennent une pluralité de pions métalliques insérés dans la face avant en verre du tube, et une pluralité de ressorts métalliques s'étendant dans une direction sensiblement parallèle à la surface externe de la face avant, les ressorts étant attachés au cadre au niveau d'une première extrémités et comportant à leur deuxième extrémité une ouverture destinée s'engager autour d'un des pions métalliques, les moyens de suspension étant caractérisé en ce que au moins deux desdits ressorts, attaché à deux cotés opposés du cadre s'étendent de manière à ce que leur première extrémité soit située du même coté du plan parallèle à l'axe longitudinal du tube et passant par le centre des ouvertures situées à leur deuxième extrémité. openings of the three identical springs are then inserted on the pin and welded on the fourth spring. The suspension springs generally extend in a direction substantially parallel to the surface of the screen in the same orientation, that is to say with respect to the frame / mask either in the direction of rotation of the needles of a shows either in the opposite direction to this direction. We know that, as indicated in US Pat. No. 4,613,785, this structure leads to problems of rotation of the frame / mask assembly when the latter expands during the operation of the tube. This rotation leads to register errors, the correspondence between the electron beams and their landing on the tube screen then no longer being nominal. Furthermore, it has been noted that this phenomenon of register error due to the expansion of the frame / mask assembly was much more sensitive for the tubes whose external surface of the front face was substantially flat; in fact it follows that the surface of the corresponding mask is then less curved than before and the resulting mechanical rigidity of the assembly lower. To reduce this sensitivity, the means for supporting a frame / mask assembly of a color cathode ray tube according to the invention comprise a plurality of metal pins inserted in the glass front face of the tube, and a plurality of springs of metal extending in a direction substantially parallel to the external surface of the front face, the springs being attached to the frame at a first end and comprising at their second end an opening intended to engage around one of the metal pins , the suspension means being characterized in that at least two of said springs, attached to two opposite sides of the frame extend so that their first end is located on the same side of the plane parallel to the longitudinal axis of the tube and passing through the center of the openings at their second end.
L'invention ainsi que ses avantages seront mieux compris à l'aide de la description ci-après et des dessins parmi lesquels : la figure 1 représente un tube à rayons cathodiques selon l'invention vu partiellement en éclaté la figure 2 représente un ressort de suspension de l'ensemble cadre/masque la figure 3 illustre un ensemble cadre/masque suspendu suivant l'état de la technique la figure 4 montre dans une vue de dessus un ensemble cadre/masque suspendu selon un mode de réalisation de l'inventionThe invention and its advantages will be better understood with the aid of the description below and of the drawings among which: FIG. 1 represents a cathode ray tube according to the invention seen partially in exploded view FIG. 2 represents a spring of suspension of the frame / mask assembly FIG. 3 illustrates a frame / mask assembly suspended according to the state of the art FIG. 4 shows in a top view a frame / mask assembly suspended according to an embodiment of the invention
Un tube à rayons cathodiques en couleurs (1), tel qu'illustré par la figures 1 , comprend une enveloppe en verre en trois parties distinctes, la face avant 2 à l'intérieur de laquelle est déposé un écran 3 fait de matériau luminescents, l'arrière 4 en forme d'entonnoir et le col 5 sensiblement cylindrique et entourant le canon à électrons 6 générant trois faisceaux électroniques en direction de l'écran. Un masque de sélection des couleurs 11 percé d'ouvertures ou de fentes est disposé dans le tube sur les trajectoires des faisceaux d'électrons, entre l'écran 3 et le canon 6. Le masque 11 est soudé sur un cadre rigide 10 maintenu en position dans la face avant du tube grâce à des moyens de suspension comprenant des pions métalliques 8 enchâssés dans la jupe en verre 7 de la. face avant et des ressorts 9 soudés sur le cadre et possédant des ouvertures destinées à coopérer avec les dits pions dont l'extrémité est généralement de forme tronconique. Le masque doit être disposé à une distance très précise de l'écran pour permettre un fonctionnement correct du tube fini, c'est-à-dire principalement que chacun des faisceaux vienne illuminer les luminophores de la couleur primaire lui correspondant. Cette distance mesurée dans la direction de l'axe principal Z du tube, est connue sous le nom de "Q distance". A color cathode ray tube (1), as illustrated in FIGS. 1, comprises a glass envelope in three distinct parts, the front face 2 inside which is deposited a screen 3 made of luminescent material, the rear 4 funnel-shaped and the neck 5 substantially cylindrical and surrounding the electron gun 6 generating three electron beams towards the screen. A color selection mask 11 pierced with openings or slots is placed in the tube on the paths of the electron beams, between the screen 3 and the barrel 6. The mask 11 is welded to a rigid frame 10 held in place position in the front face of the tube thanks to suspension means comprising metal pins 8 embedded in the glass skirt 7 of the. front face and springs 9 welded to the frame and having openings intended to cooperate with said pins, the end of which is generally of frustoconical shape. The mask must be placed at a very precise distance from the screen to allow correct operation of the finished tube, that is to say mainly that each of the beams comes to illuminate the phosphors of the primary color corresponding to it. This distance, measured in the direction of the main axis Z of the tube, is known as the "Q distance".
Comme illustré sur le schéma de la figure 1, le réglage de la QAs illustrated in the diagram in Figure 1, the adjustment of the Q
Distance s'effectue en positionnant précisément, par soudure sur le cadre, les ressorts 9 et donc leur ouverture 13 en tenant compte de la distance des pions métalliques 8 à l'écran. Les pions sont enchâssés dans le verre de la face avant lors de la fabrication de ladite face par le verrier, et doivent tous être positionnés sur un même plan parallèle à la surface de l'écran. La figure 2 illustre en détail exemple de ressort de suspension de l'ensemble cadre/masque. Le ressort 9 est solidarisé au coté du cadre 10, par exemple par soudure, en plusieurs points 20 de sa première extrémité 21; le ressort 9 comprend un bras 22 qui peut s'étendre par exemple sensiblement parallèlement au coté du cadre auquel il est solidarisé et se termine par une deuxième extrémité 23 comprenant une ouverture 24 destiné à coopérer avec un pion inséré dans la jupe du masque afin de maintenir par effet ressort le cadre dans le tube. Jusqu'à présent les dispersions dans le positionnement des pions métalliques, lesquels pouvaient se retrouver dans des plans différents, imposaient d'utiliser au moins un ressort 9 avec une ouverture de diamètre plus large que les diamètres des ouvertures des autres ressorts afin de rattraper ces dispersions. Une rondelle était préalablement placée sur le pion avant l'insertion du ressort puis l'ensemble ressort/rondelle était soudé ensemble pour immobiliser le cadre en évitant tout jeu mécanique. Comme illustré par la figure 3, il est connu d'utiliser quatre ressorts 9 disposés sensiblement au niveau des milieux des cotés du cadre 10 de telle manière que les bras de ces ressorts soient orientés dans le même sens autour du cadre, soit dans le sens des aiguilles d'une montre soit le sens inverse trigonométrique. Il en résulte que deux ressorts, attachés à deux cotés opposés du cadre s'étendent de manière à ce que leur première extrémité soit située de part et d'autre du plan parallèle à l'axe longitudinal du tube et passant par le centre des ouvertures situées à leur deuxième extrémité. Distance is effected by precisely positioning, by welding on the frame, the springs 9 and therefore their opening 13 taking into account the distance of the metal pins 8 from the screen. The pins are embedded in the glass of the front face during the manufacture of said face by the glassmaker, and must all be positioned on the same plane parallel to the surface of the screen. FIG. 2 illustrates in detail an example of a suspension spring for the frame / mask assembly. The spring 9 is secured alongside the frame 10, for example by welding, at several points 20 of its first end 21; the spring 9 comprises an arm 22 which can extend for example substantially parallel to the side of the frame to which it is secured and ends in a second end 23 comprising an opening 24 intended to cooperate with a pin inserted in the skirt of the mask in order to keep the frame in the tube by spring effect. Until now, the dispersions in the positioning of the metal pins, which could be found in different planes, required using at least one spring 9 with an opening of larger diameter than the diameters of the openings of the other springs in order to catch up with these dispersions. A washer was previously placed on the pin before inserting the spring, then the spring / washer assembly was welded together to immobilize the frame, avoiding any mechanical play. As illustrated in FIG. 3, it is known to use four springs 9 arranged substantially at the center of the sides of the frame 10 so that the arms of these springs are oriented in the same direction around the frame, that is to say in the direction clockwise or counterclockwise. As a result, two springs, attached to two opposite sides of the frame extend so that their first end is located on either side of the plane parallel to the longitudinal axis of the tube and passing through the center of the openings located at their second end.
L'invention permet de s'affranchir de ces problèmes et d'éliminer des pièces mécaniques et donc de diminuer le coût de fabrication du tube. Dans un mode de réalisation de l'invention illustré par la figure 4, l'ensemble cadre/cadre est suspendu à l'intérieur du tube grâce à trois ressorts 19, 29 de structure semblable à celle des ressorts 9 et disposés de la manière suivante : un desdits ressorts 19 est solidarisé sensiblement à l'un des grands cotés du cadre par soudure de sa première extrémité au cadre en un point C de celui-ci ; dans un mode de réalisation préférentiel l'ouverture située à sa deuxième extrémité est située sensiblement au niveau du milieu dudit coté du cadre les deux autres ressorts 29 sont solidarisées respectivement en A et B sur chacun des deux cotés courts du cadre de telle manière que les points A et B soient situés du même coté du plan passant par les ouvertures 24 desdits deux ressorts et parallèle à l'axe longitudinal Z. Les ouvertures 24 des ressorts 29 destiné à venir s'engager autour des pions situés dans la jupe 7 du panneau avant du tube peuvent être disposées soit sensiblement au niveau des milieux des cotés opposés courts du cadre soit reculées vers les coins du cadre prés du coté long opposé à celui sur lequel est attaché le ressort 19. Cette structure minimise les problèmes de rotation du cadre durant les phases de dilation thermique dues au fonctionnement du tube et l'invention permet d'obtenir en outre une très bonne stabilité mécanique de l'ensemble cadre/masque suspendu à l'intérieur du tube grâce à seulement trois ressorts ; en effet cette disposition augmente la surface du triangle de sustentation ABC par rapport à une disposition de trois ressorts selon l'état de la technique. Ainsi deux pièces métalliques sont économisées : un ressort de suspension et la rondelle d'ajustage puisque avec seulement trois The invention overcomes these problems and eliminates mechanical parts and therefore reduces the cost of manufacturing the tube. In an embodiment of the invention illustrated in FIG. 4, the frame / frame assembly is suspended inside the tube by means of three springs 19, 29 of structure similar to that of the springs 9 and arranged in the following manner : one of said springs 19 is secured substantially to one of the long sides of the frame by welding its first end to the frame at a point C thereof; in a preferred embodiment the opening located at its second end is located substantially at the middle of said side of the frame the two other springs 29 are secured respectively at A and B on each of the two short sides of the frame so that the points A and B are located on the same side of the plane passing through the openings 24 of said two springs and parallel to the longitudinal axis Z. The openings 24 of the springs 29 intended to engage around the pins located in the skirt 7 of the panel front of the tube can be arranged either substantially at the middle of the short opposite sides of the frame or moved towards the corners of the frame near the long side opposite to that on which the spring 19 is attached. This structure minimizes the problems of rotation of the frame during the thermal expansion phases due to the operation of the tube and the invention also makes it possible to obtain very good mechanical stability of the 'frame / mask assembly suspended inside the tube with only three springs; in fact, this arrangement increases the area of the lift triangle ABC compared to an arrangement of three springs according to the state of the art. Thus two metal parts are saved: a suspension spring and the adjustment washer since with only three
ressorts les trois ouvertures des ressorts sont forcément dans un même plan. Les modes de réalisations décrits en exemple ne sont pas limitatifs et l'invention peut aussi bien être mise en œuvre avec deux ressorts 29 solidarisés respectivement sur chacun des cotés opposés de grande longueur du cadre et le ressort 19 sur un des cotés court du même cadre. springs the three openings of the springs are necessarily in the same plane. The embodiments described in example are not limiting and the invention can also be implemented with two springs 29 secured respectively on each of the opposite long sides of the frame and the spring 19 on one of the short sides of the same frame .

Claims

REVENDICATIONS
1 /Tube à rayons cathodiques en couleurs (1) comprenant une face avant en verre (2) sur laquelle est déposé un écran de matériaux luminescents (3), un masque de sélection des couleurs (11) disposé à proximité de l'écran, un cadre (10) sur lequel le masque est solidarisé, ledit cadre étant de forme sensiblement rectangulaire, l'ensemble cadre/masque étant maintenu à l'intérieur de la face avant par des moyens de support, lesdits moyens de support comprenant une pluralité de pions métalliques (8) insérés dans la jupe (7) de ladite face avant en verre du tube, et une pluralité de ressorts métalliques (19,29), les ressorts étant attachés au cadre au niveau d'une première extrémités (21) et comportant à leur deuxième extrémité (23) une ouverture (24) destinée s'engager autour d'un des pions métalliques, les moyens de suspension étant caractérisé en ce que deux desdits ressorts (29), attaché à deux cotés opposés du cadre s'étendent de manière à ce que leur première extrémité soit située du même coté du plan parallèle à l'axe longitudinal du tube et passant par le centre des ouvertures situées à leur deuxième extrémité.1 / Color cathode ray tube (1) comprising a glass front face (2) on which is deposited a screen of luminescent materials (3), a color selection mask (11) placed near the screen, a frame (10) on which the mask is secured, said frame being of substantially rectangular shape, the frame / mask assembly being held inside the front face by support means, said support means comprising a plurality of metal pins (8) inserted in the skirt (7) of said glass front face of the tube, and a plurality of metal springs (19,29), the springs being attached to the frame at a first end (21) and comprising at their second end (23) an opening (24) intended to engage around one of the metal pins, the suspension means being characterized in that two of said springs (29), attached to two opposite sides of the frame are extend in such a way that e their first end is located on the same side of the plane parallel to the longitudinal axis of the tube and passing through the center of the openings located at their second end.
2 / Tube à rayons cathodiques suivant la revendication précédente caractérisé en ce que qu'il comporte un maximum de trois ressorts de suspension de l'ensemble cadre/masque, deux ressorts (29) étant chacun solidarisé respectivement à une première paire de cotés opposés et un troisième ressort (19) étant solidarisé à l'un des cotés de la deuxième paire de coté opposés.2 / cathode ray tube according to the preceding claim characterized in that it comprises a maximum of three suspension springs of the frame / mask assembly, two springs (29) each being secured respectively to a first pair of opposite sides and a third spring (19) being secured to one of the sides of the second pair of opposite sides.
3/ Tube à rayons cathodiques selon la revendication précédente caractérisé en ce que les deux ressorts (29) sont solidarisés aux cotés courts du cadre. 3 / Cathode ray tube according to the preceding claim characterized in that the two springs (29) are secured to the short sides of the frame.
4 / Tube à rayons cathodiques suivant la revendication 1 caractérisé en ce que les deux ressorts (29) sont solidarisés aux deux cotés opposés du cadre en des points A et B situés plus prés des coins du cadre que du milieu desdits cotés opposés.4 / cathode ray tube according to claim 1 characterized in that the two springs (29) are secured to the two opposite sides of the frame at points A and B located closer to the corners of the frame than the middle of said opposite sides.
5 / Tube à rayons cathodiques selon la revendication 1 caractérisé en ce que la surface externe de la face avant du tube est sensiblement plane. 5 / cathode ray tube according to claim 1 characterized in that the outer surface of the front face of the tube is substantially planar.
PCT/FR2005/050230 2004-04-19 2005-04-12 Means for suspending a mask/frame set for a cathode ray tube WO2005106914A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20040765 ITMI20040765A1 (en) 2004-04-19 2004-04-19 MEANS OF SUSPENSION OF A FRAMEWORK-MASK FOR CATHODE-TUBE
ITMI2004A000765 2004-04-19

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WO2005106914A2 true WO2005106914A2 (en) 2005-11-10
WO2005106914A3 WO2005106914A3 (en) 2006-09-14

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1223601A1 (en) * 1999-10-21 2002-07-17 Matsushita Electric Industrial Co., Ltd. Cathode-ray tube and image display comprising the same
EP1308983A1 (en) * 2001-10-30 2003-05-07 Matsushita Electric Industrial Co., Ltd. Color cathode-ray tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1223601A1 (en) * 1999-10-21 2002-07-17 Matsushita Electric Industrial Co., Ltd. Cathode-ray tube and image display comprising the same
EP1308983A1 (en) * 2001-10-30 2003-05-07 Matsushita Electric Industrial Co., Ltd. Color cathode-ray tube

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WO2005106914A3 (en) 2006-09-14

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